fix(cli): legible output on light/white terminal backgrounds

[blainekasten]

Summary

CLI help and other Rich-styled output used a dark-terminal palette (#caaef5 + ANSI dim / white). On white backgrounds that reads as near-invisible gray.

Changes

• Dual Rich themes (light / dark) in _console.py
• Auto-select via:
  1. TG_THEME or TOGETHER_CLI_THEME (light | dark)
  2. COLORFGBG (bg ≥ 7 → light)
  3. default dark
• Light theme (high contrast):
  • body text (secondary / muted / dim) → near-black (#111827 / #1f2937)
  • brand accent (primary) → bold violet-900 #4c1d95 (~11:1 on white)
  • [white] → #000000
  • all body styles assert WCAG AAA (≥7:1) on white
• Dark theme: keep the existing palette; drop dim from secondary
• Help formatter: descriptions / defaults use muted
• Questionary prompt styles follow the active theme
• Unit tests for theme resolution and light-theme contrast

Verify

TG_THEME=light tg beta models --help
TG_THEME=dark tg beta models --help
# or rely on COLORFGBG from the terminal

Test plan

• pytest tests/cli/test_console_theme.py
• pytest tests/cli/test_main.py tests/cli/test_beta_models.py
• Manual: light terminal — confirm Commands / Options / Examples are readable
• Manual: dark terminal — confirm look is unchanged aside from slightly stronger secondary text

  

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